CHEMISTRY COMMUNITY

Adriana_4F

Electron Affinity is the energy change when a neutral atom attracts an electron to become a negative ion. So yes you are, in a way, correct

Adriana_4F

Yes, it would not be covalent anymore it would be ionic. The guidelines are: If the electronegativity difference is greater than 2 then it is an ionic bond. If the electronegativity difference is less than 1.5 then it would be a covalent bond. If the difference is between 1.5 and 2 then it would be ...

Adriana_4F

Tetrahedrals are 3D shapes, not 2D. If they were 2D shapes then the angles would be 90 degrees. Remember that the shapes of molecules should be in 3D since we live in a 3D world

Adriana_4F

He has not told us what will be on the test yet but I'm guessing it's going to be on everything we learned after the midterm

Adriana_4F

What do you do to a dead chemist?

You barium

Adriana_4F

Remember that in the equation E=hv, E is the energy of only one photon...in this case photons are equivalent to particles so you would have to find out how many particles are in 5 mol of the substance and multiply that by the answer you got....that way you calculated the amount of energy ejected by ...

Adriana_4F

Stemming from what the person above said, hydrogen bonds are intermolecular not intramolecar...They are also make the strongest bonds

Adriana_4F

Covalent bonds are for intramolecular bonds while hydrogen bonds are for intermolecular bonds. in simpler terms, a covalent bond is what actually glues the H2 and O atoms to make a molecule while the hydrogen bond glues the H2O molecule with other H2O molecules to make water.

Adriana_4F

The type of atom does not affect the shape, the number of atoms do. Remember that the shape has to be a 3D shape not 2D because we live in a 3D world. Hope this helps :)

Adriana_4F

Stemming from what the last post said, if you were to melt ice, it is still H2O so the intramolecular molecules are not affected. The state of the H20 is affected though...that shows a change in intermolecular forces.

Adriana_4F

Here's a video on the basics of Lewis structures: https://www.youtube.com/watch?v=1ZlnzyHahvo
I hope this helps :)

Adriana_4F

I think the reason why is because the periodic table was created before orbitals were even discovered. The periodic table is organized in such a way that elements are grouped with other elements because of how similar in reactivity they are (ex: alkaline metals, noble gases, etc.). If you need more ...

Adriana_4F

Are you talking about Lewis structures? If so here's a video: https://www.youtube.com/watch?v=1ZlnzyHahvo
I hope this helps :)

Adriana_4F

Do we at least have to know what it's about? Or will the test just be all math?

Adriana_4F

What do you mean by resting mass?

Adriana_4F

https://www.youtube.com/watch?v=Tilkl4lRqzo

Adriana_4F

Is this going to be similar to the test next week?? Also what specific concepts do we not need to know other than Schrodinger's equation?

Adriana_4F

I was just wondering how did you prepare/study for the MCAT and get into medical school in general? I'm very interested in hearing your journey! But overall thank you so much for the, it was extremely helpful :)

Adriana_4F

I took chemistry in sophomore year of high school, but it was mainly a worksheet type class more based on completion than anything else, so I'm pretty rusty as well. I've attended the Peer Learning Facilities with the UAs though and that really seems to help as you can ask any questions you want an...

Adriana_4F

I also have a question: when you have a reaction in the form of MgSO4.7H2O where the 7 is in front of the H2O, would you have to do 7x(molar mass of H2) + the molar mass of O or 7x(the molar mass of H20)?

CHEMISTRY COMMUNITY

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Re: electron affinity

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Quantum number song

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